BIPV for Tegola Canadese roofing: photovoltaic integration without substructures

In the context of the building sector’s significant contribution to global emissions, Building Integrated Photovoltaics (BIPV) represent an effective strategy for improving energy performance. This research presents the development of a fully adhered BIPV roofing system for metal asphalt shingles by Tegola Canadese, developed in collaboration with Università Iuav di Venezia. The work addresses a key technological gap: as existing BIPV solutions for metal roofs typically require ventilated substructures, limiting architectural compatibility and installation efficiency. The methodology included: (1) analysis of existing BIPV systems and integration barriers, (2) design of a configuration compatible with full-adhesion metal shingle technology, and (3) prototyping and installation testing. The system integrates custom flexible CIGS thin-film photovoltaic modules directly onto Ultimetal HD© Slate shingles using high-strength adhesive bonding, preserving waterproofing, structural integrity, and visual continuity. Tailored protective components matching material and finish ensure cable routing and maintain aesthetic uniformity. Validation demonstrated technical feasibility, electrical performance, simplified installation, and architectural integration. The system offers competitive advantages such as elimination of substructures, reduced system costs, lower weight, and backward compatibility with existing products. This solution supports wider BIPV adoption and contributes to decarbonization goals in the building sector.